#include "utils.h"

#include <flutter_windows.h>
#include <io.h>
#include <stdio.h>
#include <windows.h>

#include <iostream>

void CreateAndAttachConsole()
{
    if (::AllocConsole()) {
        FILE *unused;
        if (freopen_s(&unused, "CONOUT$", "w", stdout)) {
            _dup2(_fileno(stdout), 1);
        }
        if (freopen_s(&unused, "CONOUT$", "w", stderr)) {
            _dup2(_fileno(stdout), 2);
        }
        std::ios::sync_with_stdio();
        FlutterDesktopResyncOutputStreams();
    }
}

std::vector<std::string> GetCommandLineArguments()
{
    // Convert the UTF-16 command line arguments to UTF-8 for the Engine to use.
    int argc;
    wchar_t **argv = ::CommandLineToArgvW(::GetCommandLineW(), &argc);
    if (argv == nullptr) {
        return std::vector<std::string>();
    }

    std::vector<std::string> command_line_arguments;

    // Skip the first argument as it's the binary name.
    for (int i = 1; i < argc; i++) {
        command_line_arguments.push_back(Utf8FromUtf16(argv[i]));
    }

    ::LocalFree(argv);

    return command_line_arguments;
}

std::string Utf8FromUtf16(const wchar_t *utf16_string)
{
    if (utf16_string == nullptr) {
        return std::string();
    }
    int target_length = ::WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS,
                                              utf16_string, -1, nullptr, 0,
                                              nullptr, nullptr);
    if (target_length == 0) {
        return std::string();
    }
    std::string utf8_string;
    utf8_string.resize(target_length);
    int converted_length = ::WideCharToMultiByte(
        CP_UTF8, WC_ERR_INVALID_CHARS, utf16_string, -1, utf8_string.data(),
        target_length, nullptr, nullptr);
    if (converted_length == 0) {
        return std::string();
    }
    return utf8_string;
}
